AlCr(Si)N和CrAl(Si)N涂层对TiAl合金900℃循环氧化性能的影响  

Influence of AlCr(Si)N and CrAl(Si)N Coatings on the Cyclic Oxidation of TiAl Alloys at 900℃

作　　者：章凯 辛丽[2] 程玉贤 彭新 王博 ZHANG Kai;XIN Li;CHENG Yuxian;PENG Xin;WANG Bo(AECC Shenyang Liming Aero-Engine Co.Ltd.,Shenyang 110043,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Shenyang Area 2nd Military Representative Room of Air Force Equipment Department,Shenyang 110042,China)

机构地区：[1]中国航发沈阳黎明航空发动机有限责任公司,沈阳110043 [2]中国科学院金属研究所,沈阳110016 [3]空装驻沈阳地区第二军事代表室,沈阳110042

出　　处：《中国表面工程》2023年第4期185-195,共11页China Surface Engineering

基　　金：国家自然科学基金(51871229);辽宁“百千万人才工程”培养经费资助项目。

摘　　要：TiAl合金作为新型高温结构材料在航空航天和汽车工业领域已获应用,然而在850℃及以上温度服役时抗氧化性不足,施加氮化物涂层在提高TiAl合金抗氧化性和耐磨性等综合性能方面独具优势,目前关于氮化物涂层对TiAl基合金抗氧化性影响的研究有限。采用多弧离子镀方法在TiAl合金表面分别制备AlCrN涂层、AlCrSiN涂层、CrAlN涂层和CrAlSiN涂层,研究涂层对TiAl合金900℃循环氧化行为的影响。XRD结果表明,AlCrN和AlCrSiN涂层主要呈现AlN结构,而CrAlN和CrAlSiN涂层为CrN结构。在AlCrSiN和CrAlSiN涂层中,Si可能固溶于晶格中形成(Al,Cr,Si)N和(Cr,Al,Si)N固溶体。在900℃经过300个周期的循环氧化,AlCrN和AlCrSiN涂层表面氧化膜主要由Al2O3组成,热循环过程中涂层中形成大量裂纹。CrAlN和CrAlSiN涂层表面氧化膜主要由Cr_(2)O_(3)组成,连续致密,无开裂剥落。其中CrAlN涂层表面Cr_(2)O_(3)膜下面形成了Al的内氧化物,其氧化增重高于CrAlSiN涂层。此外,CrAlN和CrAlSiN涂层均与TiAl合金发生较严重的互扩散,在CrAlN/TiAl界面和CrAlSiN/TiAl界面处形成较厚的互扩散层。可见,CrAlN和CrAlSiN涂层显著提高了TiAl合金的抗高温氧化性能,而涂层中Si的添加使得涂层抗氧化性得到进一步的提升。研究结果可为TiAl合金施加氮化物涂层高温防护提供潜在可能。TiAl-based alloys are used in the aerospace and automotive industries because of their low density,reliable strength,and good oxidation resistance.However,the Al content of the TiAl-based alloys is approximately 50 at.%;thus,it cannot form a protective alumina scale when oxidized over 850℃,resulting in poor high-temperature oxidation resistance.Many coatings such as metallic,ceramic,aluminide or silicide diffusion,and glass coatings have been investigated to improve the oxidation resistance of TiAl alloys.Furthermore,the effects of alloying or halogens on the oxidation of TiAl alloys have been studied.Nitride coatings have unique advantages for improving the comprehensive properties of TiAl alloys owing to their wear and oxidation resistance.However,studies on the effect of nitride coatings on the oxidation resistance of TiAl-based alloys are limited.In this study,a multi-arc ion plating system was used to deposit AlCrN,AlCrSiN,CrAlN,and CrAlSiN coatings on a TiAl alloy.The influence of AlCr(Si)N and CrAl(Si)N coatings on the cyclic oxidation of the TiAl alloy was investigated at 900℃.Furthermore,the influence of the Al content on the coating structure and thermal cycle resistance was investigated.The as-deposited AlCr(Si)N and CrAl(Si)N coatings were homogeneous,compact,and well combined with the matrix alloy.Compared with the CrAl(Si)N coatings,the AlCr(Si)N coatings exhibited a deeper contrast in scanning electron micro scopes back scattered electron pattern,which might be related to the higher Al content.X-ray diffraction patterns showed that the AlCrN and AlCrSiN coatings exhibited an AlN structure,whereas the CrAlN and CrAlSiN coatings exhibited CrN structures.Si may have dissolved into the crystal lattice of the AlCrSiN and CrAlSiN coatings to form(Al,Cr,Si)N and(Cr,Al,Si)N solid solutions.During oxidation for 300 cycles at 900℃,oxide scales primarily composed of Al2O3 formed at the surface of AlCrN and AlCrSiN coatings,and numerous cracks formed in the coatings.Aluminum and titanium reacted with oxy

关 键 词：氮化物涂层 金属间化合物 高温氧化 互扩散 

分 类 号：TG156[金属学及工艺—热处理] TB114[金属学及工艺—金属学]